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"""
M2Crypto wrapper for OpenSSL BN (BIGNUM) API.
Copyright (c) 2005 Open Source Applications Foundation. All rights reserved.
"""
import m2
def rand(bits, top=-1, bottom=0):
"""
Generate cryptographically strong random number.
@param bits: Length of random number in bits.
@param top: If -1, the most significant bit can be 0. If 0, the most
significant bit is 1, and if 1, the two most significant
bits will be 1.
@param bottom: If bottom is true, the number will be odd.
"""
return m2.bn_rand(bits, top, bottom)
def rand_range(range):
"""
Generate a random number in a range.
@param range: Upper limit for range.
@return: A random number in the range [0, range)
"""
return m2.bn_rand_range(range)
def randfname(length):
"""
Return a random filename, which is simply a string where all
the characters are from the set [a-zA-Z0-9].
@param length: Length of filename to return.
@type length: int
@return: random filename string
"""
letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890'
lettersLen = len(letters)
fname = []
for x in range(length):
fname += [letters[m2.bn_rand_range(lettersLen)]]
return ''.join(fname)